[m88k] Better support for PHI

2 files changed, 8 insertions, 0 deletions

diff --git a/llvm/lib/Target/M88k/GISel/M88kInstructionSelector.cpp b/llvm/lib/Target/M88k/GISel/M88kInstructionSelector.cpp
index 1dd1375..acc3deae 100644
--- a/llvm/lib/Target/M88k/GISel/M88kInstructionSelector.cpp
+++ b/llvm/lib/Target/M88k/GISel/M88kInstructionSelector.cpp
@@ -790,6 +790,13 @@ bool M88kInstructionSelector::select(MachineInstr &I) {
   case TargetOpcode::G_MERGE_VALUES:
   case TargetOpcode::G_UNMERGE_VALUES:
     return selectMergeUnmerge(I, MBB, MRI);
+  case TargetOpcode::G_PHI: {
+    I.setDesc(TII.get(TargetOpcode::PHI));
+
+    Register DstReg = I.getOperand(0).getReg();
+    const TargetRegisterClass *RC = guessRegClass(DstReg, MRI, TRI, RBI);
+    return RBI.constrainGenericRegister(DstReg, *RC, MRI);
+  }
   default:
     return false;
   }
diff --git a/llvm/lib/Target/M88k/GISel/M88kLegalizerInfo.cpp b/llvm/lib/Target/M88k/GISel/M88kLegalizerInfo.cpp
index 345f3bc..b1d9b24 100644
--- a/llvm/lib/Target/M88k/GISel/M88kLegalizerInfo.cpp
+++ b/llvm/lib/Target/M88k/GISel/M88kLegalizerInfo.cpp
@@ -30,6 +30,7 @@ M88kLegalizerInfo::M88kLegalizerInfo(const M88kSubtarget &ST) {
   const LLT S64 = LLT::scalar(64);
   const LLT S80 = LLT::scalar(80);
   const LLT P0 = LLT::pointer(0, 32);
+  getActionDefinitionsBuilder(G_PHI).legalFor({S32, P0});
   getActionDefinitionsBuilder(G_SELECT)
       .customForCartesianProduct({S32, S64, P0}, {S1});
   getActionDefinitionsBuilder({G_IMPLICIT_DEF, G_FREEZE}).legalFor({S32});